Open AccessCompact SIW cavity MIMO antenna with enhanced bandwidth and high isolation
Author(s) -
Niu BingJian,
Tan JieHong
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2019.0838
Subject(s) - bandwidth (computing) , optoelectronics , miniaturization , excited state , materials science , mimo , optics , antenna efficiency , physics , electrical engineering , antenna (radio) , radiation pattern , engineering , telecommunications , channel (broadcasting) , nuclear physics
A compact substrate‐integrated‐waveguide (SIW) cavity multiple‐input–multiple‐output (MIMO) antenna with enhanced bandwidth and high isolation is proposed. It is based on a triangle half‐mode SIW cavity with one open edge and two edges shorted by metallic vias. By etching three slots, the single cavity can be divided into four eighth‐mode sub‐cavities. Two large sub‐cavities with the same size are excited by two coaxial ports to construct two antenna elements and a wide slot between them is utilised as the de‐coupler. Therefore, high isolation can be obtained. On the other hand, cavity energy can be coupled from the excited sub‐cavities to the unexcited sub‐cavities due to two narrow T‐shaped slots serving as the couplers. Therefore, enhanced bandwidth can be achieved by merging two coupled modes into the required operating band. A fabricated prototype centring at 3.51 GHz has been measured. With a compact size of 0.59λ 0 × 0.59λ 0 , enhanced bandwidth of 160 MHz, high isolation of 19.5 dB, the antenna gain of 4.9 dBi, and radiation efficiency of 72.8%, the proposed design has potential applications for fifth‐generation communication.